// Copyright 2024 Flant JSC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package input

import (
	"regexp"
	"strings"
)

var YAMLSplitRegexp = regexp.MustCompile(`(?:^|\s*\n)---\s*`)

func CombineYAMLs(yamls ...string) string {
	var res string
	for _, yaml := range yamls {
		if yaml == "" {
			continue
		}

		docs := YAMLSplitRegexp.Split(strings.TrimSpace(yaml), -1)

		for _, doc := range docs {
			trimmedDoc := strings.TrimSpace(doc)

			if trimmedDoc == "" || trimmedDoc == "---" {
				continue
			}

			if res != "" {
				res += "---\n"
			}

			res = res + trimmedDoc + "\n"
		}
	}

	return res
}
